Re: Unable to Package Playbook App using Ripple Emulator Extension.

Are you using Windows? If so, make sure that the bbwp.exe file (included within the WebWorks SDK installation folder) has permission to run. Sometimes Windows blocks *.exe files it doesn't recognize, and we've seen that generate errors like this.

I believe this means that Windows is restricting access for bbwp.exe to use java.exe. You will also need to ensure that java.exe are also running with administrator priveledges. Try looking in c:\program files\java\<version>\bin for this file?